| 摘要 |
PURPOSE:To prevent unnecessary radiation without any deterioration in the quality of a necessary signal by previously accentuating the high frequency component of a signal to be transmitted, and attenuating the accentuated high frequency component of the signal. CONSTITUTION:A digital circuit 30 is housed in a shield case 100, whose opening part is blocked with a printed board 101. On the board 101, unnecessary radiation preventing circuits 211, 311, and 321 are formed and connected to a DC power source line 21, a signal line 31 from input equiment, a signal line 32a to output equipment, and a circuit 30, and any unnecessary high frequency component is not fed to respective signal line. The output port signal line 32 of the circuit 30 is connected to an emphasis circuit and an adding circuit AD. The circuit EN accentuates the high frequency component of a pulse signal led to the signal line 32, and the output is sent out to the circuit AD. The circuit AD sums up the original signal and accentuated signal to supply the sum signal through a current booster to a high frequency component attenuating filter, which attenuates the accentuated component to supply a signal having the same waveform with the original signal to the output equipment. |
